Method and device for manufacturing an acoustic absorbent panel

Abstract

The invention relates to a method for manufacturing an acoustic absorbent panel, comprising the following steps: provision of a sheet of plastic material, formation of a plurality of through-slots in the sheet by milling using at least one milling tool. The invention makes it possible to manufacture an acoustic absorbent panel quickly and inexpensively.

The invention claimed is: 
     
       1. A method for manufacturing an acoustic absorbent panel, the method comprising:
 milling, with a milling tool, a plurality of through-slots in a sheet comprising a plastic material, 
 
       wherein
 the plastic material comprises at least one of a linear thermoplastic polyester, polyethylene terephthalate (PET), polycarbonate (PC) and polymethyl methacrylate (PMMA), 
 the plurality of through-slots have a width between 0.2 and 0.4 mm, and 
 the percentage surface area of the through-slots relative to the total surface area of the panel is from 1.5 to 5%, 
 and wherein, during the milling, the sheet is positioned such that the milling tool faces a first point on the sheet, to form a first slot; and then, 
 the sheet is moved away from the milling tool and repositioned such that the milling tool faces at least one second point on the sheet, to form at least one second slot. 
 
     
     
       2. The method of  claim 1 , wherein the milling is carried out with a plurality of milling tools. 
     
     
       3. The method of  claim 1 , wherein, during the milling, the milling tool is sprayed with water, thereby cooling and cleaning the milling tool. 
     
     
       4. The method of  claim 1 , wherein the slots are formed parallel to one another, on one and the same line or staggered. 
     
     
       5. The method of  claim 1 , wherein a plurality of slots are formed parallel to a first direction, then a plurality of slots are formed parallel to a second direction, which is different from the first direction. 
     
     
       6. The method of  claim 1 , further comprising, before the milling:
 decorating the sheet with a water-resistant ink, paint, or varnish; then/or 
 coating the sheet with a scratch-proof varnish. 
 
     
     
       7. The method of  claim 1 , wherein the plastic material comprises a linear thermoplastic polyester. 
     
     
       8. The method of  claim 1 , wherein the plastic material comprises a polyethylene terephthalate (PET). 
     
     
       9. The method of  claim 1 , wherein the plastic material comprises a polycarbonate (PC). 
     
     
       10. The method of  claim 1 , wherein the plastic material comprises a polymethyl methacrylate (PMMA). 
     
     
       11. The method of  claim 1 , wherein the plastic material comprises a polyethylene terephthalate glycol. 
     
     
       12. The method of  claim 1 , wherein the sheet has a thickness of between 4 and 5 mm.